WLC with 2 WLANs, 1 voice @ 2.4GHz and 1 data @ 5GHz 802.11n

I have a WLC 4400 series and am using 1142n APs. Am planning on adding Wireless IP Phones such as 7921/7925 as well as a couple 9971's. Is it possible to have 2 WLANs, one to connect the voice endpoints to running @ 2.4GHz and another WLAN with a different SSID for data clients @ 5GHz? All data clients have 802.11n NICs and can operate @ 5GHz. I have enough APs so that the lessened range of 5GHz won't pose any issues. Ideally I'd like to see connection rates in the 240mbps-300mbps range on the data clients with data throughput rates of 100mbps+ (I don't think this ought to be an issue, I'm aware that wireless is half-duplex and that connection rates do not necessarily indicate actual throughput rates). I am also NOT a wireless expert. I'm still fairly new to working with the WLC and the managed APs as such.
The reason for 2.4GHz and 5GHz simultaneously is that the voice endpoints are all 2.4GHz radios, I believe 802.11b/g. I also want to keep voice clients separate. This way, I believe I can optimize one WLAN for data clients without having them "suffer" so to speak by having to operate at a lower level as the voice clients. Also, I want the voice separate for quality there (separate voice VLAN). If I am correct, 802.11n data rates can also be achieved @ 2.4GHz, but only using the 20MHz as opposed to 40MHz width. So I'd like one WLAN to be 2.4GHz, 20MHz (voice) and the other WLAN 5GHz, 40MHz (data).
I'd like to hav both WLANs broadcasted from all the APs simultaneously. Am I correct that such a configuration is possible with the WLC 4400 series and Aironet 1142n APs? WLC is running 7.0.240 btw, current stable. I'm also starting with a clean config on the WLC. All DHCP will be handled by an external DHCP server also. Thank you very much for any suggestions/guidance on this. Your thoughts are greatly appreciated!
I'll be happ to supply any config information to assist with this, just let me know what is desired/useful.

Thank you for your prompt response. I only have 1 WLC, it is a 4402-50. I believe that 7.0.240 is the most current release for that model. I think anything higher I need to go to the WLC5508 (or vWLC?)
Also, I wasn't aware that the 7921/25 were 5GHz, since they are both 802.11g. Thank you for the information.
If I understand you correctly, I'm best creating 2 WLANs, but both at 5.0GHz for both data and voice?
Also, sorry to confuse the issue further, but I was thinking about this after writing the original post, I'd like to also have a "guest" WLAN that supports both 2.4GHz and 5.0GHz for maximum client compatibility (as I have no way of knowing what tpye of WLAN NIC would be in guest devices). Am I correct in assuming that I would create a separate WLAN for all these, including a separate SSID.
The part that is confusing me some now is the "AP Groups". Do I leave a single "Default-group" and create multiple WLANs with that. If I'm correct, this way I can push the WLANs and SSIDs out through all the WAPs in that group. I want these WLANs to be available from any AP in the organization, not have some APs for one WLAN, other APs for another WLAN, etc.

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I looked in the Airport Extreme's logs, and it indicates that the Express is only connected at 54 mbps, as though it were a 802.11g Express. I have no idea why this is!
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